html,
body {
  height: 100%;
  font-size: 12px;
  font-family: PingFang SC, Arial, Microsoft YaHei, sans-serif;
}
a:hover {
  text-decoration: none;
}
.about_header {
  width: 100%;
  height: 100px;
  position: fixed;
  z-index: 1;
}
.about_header .header_container {
  margin: 0 auto;
  width: 90%;
  height: 100%;
}
.about_header .header_container .about_logo {
  float: left;
  height: 50px;
  font-size: 25px;
  color: white;
}
.about_header .header_container .about_logo img {
  vertical-align: middle;
  height: 100%;
}
.about_header .header_container .about_logo span {
  font-weight: 500;
  line-height: 100px;
}
.about_header .header_container .about_ul {
  height: 100%;
  float: right;
}
.about_header .header_container .about_ul li {
  display: inline-block;
  height: 100%;
  margin-left: 32px;
  font-weight: 500;
}
.about_header .header_container .about_ul li a {
  height: 100%;
  line-height: 100px;
  font-size: 20px;
  padding: 7px;
  color: #FFF;
}
.about_header .header_container .about_ul li a:hover {
  color: #e55c52;
}
.about_banner {
  position: relative;
  width: 100%;
  height: 450px;
  text-shadow: 0px 2px 2px rgba(0, 0, 0, 0.3);
}
.about_banner .about_banWord {
  position: absolute;
  left: 50%;
  top: 50%;
  color: #FFF;
  transform: translate(-50%, -50%);
  -webkit-transform: translate(-50%, -50%);
  text-align: center;
}
.about_banner .about_banWord strong {
  line-height: 2;
  font-size: 55px;
  font-weight: 700;
  letter-spacing: 4px;
}
.about_banner .about_banWord hr {
  width: 95%;
  height: 0;
  background: white;
  border: 2px solid white;
}
.about_banner .about_banWord em {
  letter-spacing: 7px;
  font-size: 24px;
  line-height: 2.5;
}
.about_footer {
  padding: 30px 0 30px 0;
  border-top: 2px solid rgba(0, 0, 0, 0.1);
}
.about_footer p {
  text-align: center;
}
.index_backTop {
  position: fixed;
  right: 2%;
  bottom: 20%;
  width: 60px;
  height: 60px;
}
.index_backTop a {
  display: inline-block;
  width: 100%;
  height: 100%;
  background: url(../img/callback.png) center no-repeat;
  background-size: cover;
}
